NDLI: Max-log demapper architecture design for DVB-T2 rotated QAM constellations

Content Provider	IEEE Xplore Digital Library
Author	Jianxiao Yang Meng Li Min Li Nour, C.A. Douillard, C. Geller, B.
Copyright Year	2015
Description	Author affiliation: Green Radio Group, IMEC, Heverlee, Belgium (Meng Li) \|\| ELEC Dept. Electron., Inst. Mines Telecom - Telecom Bretagne, Brest, France (Nour, C.A.; Douillard, C.) \|\| NXP Semicond., Leuven, Belgium (Min Li) \|\| Dept. U2IS, UPSA, Palaiseau, France (Jianxiao Yang; Geller, B.)
Abstract	Rotated and cyclic-Q delayed (RCQD) quadrature amplitude modulation (QAM) improve DVB-T2 system performance over highly time-frequency selective channels. However, when compared with conventional QAM demapper, the RCQD demapper requires a higher computational complexity. In this paper, a complexity-reduced max-log demapper is derived and implemented over a FPGA platform. The proposed demapper allows to find the maximum likelihood (ML) point with a search spanning only √M signal constellation points and guarantees to obtain the same log-likelihood ratio (LLR) metrics as the optimum max-log soft decision demapper while spanning at most 2√M signal constellation points. The optimized hardware implementation introduces only a slight performance loss compared to the floating-point full complexity max-log performance.
Starting Page	1
Ending Page	6
File Size	2829987
Page Count	6
File Format	PDF
e-ISBN	9781467396042
DOI	10.1109/SiPS.2015.7344998
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-10-14
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Quadrature amplitude modulation Constellation diagram Computational complexity Fading Euclidean distance Algorithm design and analysis Max-Log Demapper DVB-T2 Rotated and Cyclic Q Delayed (RCQD) Constellations Log-Likelihood Ratio (LLR)
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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